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[04/12] riscv: mm: init: Pass a pointer to virt_to_page()

Message ID 20230503-virt-to-pfn-v6-4-rc1-v1-4-6c4698dcf9c8@linaro.org
State New
Headers
Series arch: Make virt_to_pfn into a static inline |

Commit Message

Linus Walleij May 11, 2023, 11:59 a.m. UTC 
  Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this in the RISCV mm init code, so we can implement
a strongly typed virt_to_pfn().

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/riscv/mm/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Alexandre Ghiti May 12, 2023, 8:56 a.m. UTC | #1 
+cc linux-riscv

On 5/11/23 13:59, Linus Walleij wrote:
> Functions that work on a pointer to virtual memory such as
> virt_to_pfn() and users of that function such as
> virt_to_page() are supposed to pass a pointer to virtual
> memory, ideally a (void *) or other pointer. However since
> many architectures implement virt_to_pfn() as a macro,
> this function becomes polymorphic and accepts both a
> (unsigned long) and a (void *).
>
> Fix this in the RISCV mm init code, so we can implement
> a strongly typed virt_to_pfn().
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
>   arch/riscv/mm/init.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 747e5b1ef02d..2f7a7c345a6a 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -356,7 +356,7 @@ static phys_addr_t __init alloc_pte_late(uintptr_t va)
>   	unsigned long vaddr;
>   
>   	vaddr = __get_free_page(GFP_KERNEL);
> -	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
> +	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page((void *)vaddr)));
>   
>   	return __pa(vaddr);
>   }
> @@ -439,7 +439,7 @@ static phys_addr_t __init alloc_pmd_late(uintptr_t va)
>   	unsigned long vaddr;
>   
>   	vaddr = __get_free_page(GFP_KERNEL);
> -	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
> +	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page((void *)vaddr)));
>   
>   	return __pa(vaddr);
>   }
>

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks,

Alex
diff mbox series

Patch

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 747e5b1ef02d..2f7a7c345a6a 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -356,7 +356,7 @@  static phys_addr_t __init alloc_pte_late(uintptr_t va)
 	unsigned long vaddr;
 
 	vaddr = __get_free_page(GFP_KERNEL);
-	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
+	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page((void *)vaddr)));
 
 	return __pa(vaddr);
 }
@@ -439,7 +439,7 @@  static phys_addr_t __init alloc_pmd_late(uintptr_t va)
 	unsigned long vaddr;
 
 	vaddr = __get_free_page(GFP_KERNEL);
-	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
+	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page((void *)vaddr)));
 
 	return __pa(vaddr);
 }